Reborn as Fu Wan, a fisherman's wife whose in-laws coveted a pigeon egg-sized fish pearl, her husband Shen Dongsheng obeyed his mother's orders and personally pressed her into a water vat to force her to spit out the pearl. In this desperate situation, Fu Wan, having swallowed the fish pearl, awakened the superpower of underwater breathing. Seizing the opportunity to rebel publicly, she decisively divorced and took her daughter Shen Lingling back to her precarious maiden home with the compensation money. Her father had perished in the sea, her brother had been severely wounded by a stingray and bedridden, and the household struggled to survive while facing the village's prejudices and gossip against women going out to sea. Refusing to bow to fate, Fu Wan relied on the special ability bestowed by the pearl, donned her ancestral mermaid raiment to venture into the vast sea, combed the beaches for catch, salvaged marine goods, and earned money to cure her elder brother.